fromString static method
Parses a string into a SigningAlgorithm.
Returns null if the string does not match a known algorithm.
Implementation
static SigningAlgorithm? fromString(final String? value) {
if (value == null) return null;
final upper = value.toUpperCase();
for (final alg in SigningAlgorithm.values) {
if (alg.label == upper) return alg;
}
return null;
}